How to Say "monsignor" in Spanish
The Spanish word for “monsignor” is “monseñor” — B2 level.

Examples
El monseñor saludó a todos después de la iglesia.
The monsignor greeted everyone after church.
El Papa nombró a dos nuevos monseñores en esta diócesis.
The Pope appointed two new monsignors in this diocese.
Es un honor recibir a Monseñor Rodríguez en nuestra humilde casa.
It is an honor to welcome Monsignor Rodriguez to our humble home.
Using the Title
Just like 'Doctor' or 'Professor,' you usually use 'el' before 'monseñor' when talking about him, but not when speaking directly to him.
Capitalization Rules
In Spanish, titles like 'monseñor' are usually lowercase unless they start a sentence or are part of a formal address used without the person's name.
Don't use it for every priest
Mistake: “Calling any local priest 'monseñor'.”
Correction: Only use it for priests who have officially received this honorary title from the Pope. Use 'padre' (father) for others.
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